<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>计算器</title>
    <script type="text/javascript" src="jquery.min.js"></script>
    <script type="text/javascript" src="counter.js"></script>
    <link rel="stylesheet" href="counter.css">
</head>
<body>
<div class="counterdiv">
    <label>计算器</label>
    <div>
        <input id="result" class="zssinput" value="0" readonly="readonly">
    </div>
    <div>
        <div class="zssline">
            <button type="button" id="seven" class="zssbutton" value="7" onclick="toolbar_click('seven')">7</button>
            <button type="button" id="eight" class="zssbutton" value="8" onclick="toolbar_click('eight')">8</button>
            <button type="button" id="nine" class="zssbutton" value="9" onclick="toolbar_click('nine')">9</button>
            <button type="button" id="plus" class="zssbutton" value="+" onclick="toolbar_click('plus')">+</button>
        </div>
        <div class="zssline">
            <button type="button" id="four" class="zssbutton" value="4" onclick="toolbar_click('four')">4</button>
            <button type="button" id="five" class="zssbutton" value="5" onclick="toolbar_click('five')">5</button>
            <button type="button" id="six" class="zssbutton" value="6" onclick="toolbar_click('six')">6</button>
            <button type="button" id="minus" class="zssbutton" value="-" onclick="toolbar_click('minus')">-</button>
        </div>
        <div class="zssline">
            <button type="button" id="one" class="zssbutton" value="1" onclick="toolbar_click('one')">1</button>
            <button type="button" id="two" class="zssbutton" value="2" onclick="toolbar_click('two')">2</button>
            <button type="button" id="three" class="zssbutton" value="3" onclick="toolbar_click('three')">3</button>
            <button type="button" id="timesSign" class="zssbutton" value="*" onclick="toolbar_click('timesSign')">*</button>
        </div>
        <div class="zssline">
            <button type="button" id="clear" class="zssbutton" value="c" onclick="toolbar_click('clear')">c</button>
            <button type="button" id="zero" class="zssbutton" value="0" onclick="toolbar_click('zero')">0</button>
            <button type="button" id="equal" class="zssbutton" value="=" onclick="toolbar_click('equal')">=</button>
            <button type="button" id="divisionSign" class="zssbutton" value="/" onclick="toolbar_click(' divisionSign')">/</button>
        </div>
    </div>
</div>
</body>
</html>